Not a direct Runble per se, but it is a direct competition. Here's how it works.

The Setting: A standard-sized sports arena.
The Rules: At the starting buzzer, zombies (shamblers, not runners) begin pouring into the arena. Each contestant has 3 minutes to slaughter as many zombies as they can. Contestants are free to use any weapon 'normally' associated with them (in other words, not something that was only used once or twice in a special circumstance). Assume unlimited infinite ammo for any weapon that uses ammo. For contestants who have significantly changed between eras/ writers/ games/ etc, please specificy which 'version' you're selecting.
The Winner: Whoever kills the most zombies.